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Ferreira, M.B., M. Munoz-Morales, C. Saez, P.Canizares, C.A. Martinez-Huitle, et al.
Science of The Total Environment 713:136647(2020)

Three advanced oxidation and three zero-valent iron (AOP-ZVI) processes were combined into nine different tests to determine which demonstrated potential as pretreatment for the biological degradation processes of organochlorinated pollutants. To do this, the changes undergone in the respirometric behavior, toxicity, and short-term biodegradability were compared. The three AOPs studied were anodic oxidation with mixed metal oxides anodes, with boron-doped diamond (BDD) anodes, and photolysis. They were evaluated in three different modes: without any addition of ZVI, with ZVI-dehalogenation as pre-treatment, and with ZVI-dehalogenation simultaneous to the AOP treatment. Clopyralid was used as a chlorinated hydrocarbon pollutant. Results show that the technologies could successfully treat wastes polluted with clopyralid. Lower toxicity was achieved using ZVI dehalogenation, and BDD-electrolysis improved the biodegradability of the effluents. The biological characteristics of the waste were significantly modified by dehalogenating the waste with ZVI, either previously to the treatment or simultaneously to the treatment.

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